Brown mountain has some nasty trails as well as some easier ones. For the price you cant beat it. There is a message board at the parking lot near the bathrooms that has the trail maps as well as their experience levels. As long as you stay on the easy trails you should be fine. I suggest a good pair of riding boots and helmet that breathes well. I didnt start riding with boots until this year and wont ride without em now. A helmet that breathes well is a must this time of year.
Anyways, I personally like Brown alot, Its one of the places I ride most.
Make sure you have plenty of fluids. The sun really pulls the water out of ya.
Have Fun! Maybe I'll see ya there.